I think SPx2 is much better than the double XP only because as you inch closer to level 40, you have to grind the higher portions of the training tower just to get SP points. Those can be tough sometimes.
I have Mae for double SP with Blue Tome users and Gray for double SP with Sword Users. The very last Tempest Trial that happened, Gray earned 24 SP per K.O, which was just absolutely insane.
Definitely take advantage of these abilities, as they pay for themselves in the long run. Trust me. Double SP overall is the best event, so use these abilities to stockpile more.
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